[1] Univ Bern, Inst Social & Prevent Med, Bern, Switzerland
[2] Univ Bristol, Sch Social & Community Med, Bristol, Avon, England
[3] UCL, Res Dept Infect & Populat Hlth, Ctr Sexual Hlth & HIV Res, London, England
[4] Univ Birmingham, Hlth Econ Facil, Birmingham, W Midlands, England
[5] Sheffield Teaching Hosp NHS Fdn Trust, Acad Directorate Commun Dis, Sheffield, S Yorkshire, England
[6] Univ Brighton, Brighton & Sussex Med Sch, Brighton, E Sussex, England
[7] London Sch Hyg & Trop Med, Infect Dis Epidemiol Unit, London WC1, England
[8] Hlth Protect Agcy, Modelling & Econ Unit, London, England
[9] Univ London Imperial Coll Sci Technol & Med, MRC, Sch Publ Hlth, Ctr Outbreak Anal & Modelling, London, England
[10] Univ London Imperial Coll Sci Technol & Med, Fac Med, Dept Infect Dis Epidemiol, London, England